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Risk-based breast cancer screening stratified women by genetic risk and screening intensity. While safe, this approach did not decrease biopsy rates compared to annual mammography.

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Area of Science:

  • Oncology
  • Genetics
  • Preventive Medicine

Background:

  • Individual breast cancer risk assessment can optimize screening strategies.
  • Current screening methods may not efficiently allocate resources to high-risk individuals.

Purpose of the Study:

  • To evaluate the feasibility of risk-based breast cancer screening as an alternative to annual mammography.
  • To determine if risk stratification improves screening outcomes.

Main Methods:

  • A pragmatic, multicenter randomized clinical trial compared risk-based screening with annual mammography in women aged 40-74.
  • Risk assessment involved genetic sequencing, polygenic risk scores, and a validated risk model.
  • Screening recommendations varied based on calculated 5-year risk and genetic factors.

Main Results:

  • Risk-based screening was noninferior for detecting stage ≥IIB cancers but did not reduce biopsy rates compared to annual screening.
  • Fewer mammograms were performed in the risk-based group, yet biopsy rates were not significantly lower.
  • Cancer incidence, biopsy, mammogram, and MRI rates increased with higher risk categories.

Conclusions:

  • Risk-based breast cancer screening, incorporating genetic testing, effectively stratified risk and screening intensity.
  • This approach did not lead to a reduction in biopsy rates.
  • Further research may be needed to optimize risk-based screening protocols to reduce unnecessary biopsies.